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codec.go
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113 lines (95 loc) · 3.41 KB
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package ormfield
import (
"io"
"google.golang.org/protobuf/reflect/protoreflect"
"google.golang.org/protobuf/types/known/durationpb"
"google.golang.org/protobuf/types/known/timestamppb"
"cosmossdk.io/orm/types/ormerrors"
)
// Codec defines an interface for decoding and encoding values in ORM index keys.
type Codec interface {
// Decode decodes a value in a key.
Decode(r Reader) (protoreflect.Value, error)
// Encode encodes a value in a key.
Encode(value protoreflect.Value, w io.Writer) error
// Compare compares two values of this type and should primarily be used
// for testing.
Compare(v1, v2 protoreflect.Value) int
// IsOrdered returns true if callers can always assume that this ordering
// is suitable for sorted iteration.
IsOrdered() bool
// FixedBufferSize returns a positive value if encoders should assume a
// fixed size buffer for encoding. Encoders will use at most this much size
// to encode the value.
FixedBufferSize() int
// ComputeBufferSize estimates the buffer size needed to encode the field.
// Encoders will use at most this much size to encode the value.
ComputeBufferSize(value protoreflect.Value) (int, error)
}
type Reader interface {
io.Reader
io.ByteReader
}
var (
timestampMsgType = (×tamppb.Timestamp{}).ProtoReflect().Type()
timestampFullName = timestampMsgType.Descriptor().FullName()
durationMsgType = (&durationpb.Duration{}).ProtoReflect().Type()
durationFullName = durationMsgType.Descriptor().FullName()
)
// GetCodec returns the Codec for the provided field if one is defined.
// nonTerminal should be set to true if this value is being encoded as a
// non-terminal segment of a multi-part key.
func GetCodec(field protoreflect.FieldDescriptor, nonTerminal bool) (Codec, error) {
if field == nil {
return nil, ormerrors.InvalidKeyField.Wrap("nil field")
}
if field.IsList() {
return nil, ormerrors.InvalidKeyField.Wrapf("repeated field %s", field.FullName())
}
if field.ContainingOneof() != nil {
return nil, ormerrors.InvalidKeyField.Wrapf("oneof field %s", field.FullName())
}
if field.HasOptionalKeyword() {
return nil, ormerrors.InvalidKeyField.Wrapf("optional field %s", field.FullName())
}
switch field.Kind() {
case protoreflect.BytesKind:
if nonTerminal {
return NonTerminalBytesCodec{}, nil
}
return BytesCodec{}, nil
case protoreflect.StringKind:
if nonTerminal {
return NonTerminalStringCodec{}, nil
}
return StringCodec{}, nil
case protoreflect.Uint32Kind:
return CompactUint32Codec{}, nil
case protoreflect.Fixed32Kind:
return FixedUint32Codec{}, nil
case protoreflect.Uint64Kind:
return CompactUint64Codec{}, nil
case protoreflect.Fixed64Kind:
return FixedUint64Codec{}, nil
case protoreflect.Int32Kind, protoreflect.Sint32Kind, protoreflect.Sfixed32Kind:
return Int32Codec{}, nil
case protoreflect.Int64Kind, protoreflect.Sint64Kind, protoreflect.Sfixed64Kind:
return Int64Codec{}, nil
case protoreflect.BoolKind:
return BoolCodec{}, nil
case protoreflect.EnumKind:
return EnumCodec{}, nil
case protoreflect.MessageKind:
msgName := field.Message().FullName()
switch msgName {
case timestampFullName:
return TimestampCodec{}, nil
case durationFullName:
return DurationCodec{}, nil
default:
return nil, ormerrors.InvalidKeyField.Wrapf("%s of type %s", field.FullName(), msgName)
}
default:
return nil, ormerrors.InvalidKeyField.Wrapf("%s of kind %s", field.FullName(), field.Kind())
}
}